Composite task: extend SegsEd asset selector

AssetSelector constructor should verify that the local directory contains the required data files
AssetSelector::on_fsTree_doubleClicked should recognize file type based on the asset file path
Asset types could be converted to an enum
It would be nice if AssetSelector supported 'only show known files' mode ( filtering ? )
Add window names to various editor windows
convert editor windows to floating/dockable ones, instead of using MDI
make the main window size large enough to accommodate the origin editor?

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